Public Mosaic C2 indicators
confirmed host

156.239.224.131

Cobalt Strikecommand-and-control server · :50050, :80

On AS154321.

listed last confirmed feed checked TLP:CLEAR Suricata rules Show in the live feed

Relations

Values this address shares with other hosts in this archive, rarest first, watermarks last. A shared value says the hosts were set up alike, not that one operator runs them.

SharedValueOther hosts
Issuance cohort2166164053c1_2166164053c1_30d204a01551_60e4afe8b719_9499aee670fe2 other hosts · 2 listed
JA4X template2166164053c1_2166164053c1_30d204a01551420 other hosts · 417 listed
Cobalt Strike watermark987654321166 other hosts · 166 listed

A Cobalt Strike watermark is a weak link: cracked and leaked builds share one.

Not shared with any other host in this archive: 1 server key, 1 certificate.

Network context

SharedValueOther hosts
NetworkAS154321 · CORENET CLOUD SDN. BHD8 other hosts · 8 listed

Hosts near this one, for context only.

Summary

First seen by the scanner2026-09-20
In this archive since2026-09-20
Ports2 · 2 listed
Evidence1 certificate · 1 beacon configuration · 10 files served
Look up elsewhereVirusTotal · Shodan · Censys
About this listingWhat a listing means · Is this your address?

Ports

This address answered on 2 ports. First seen and last confirmed dates are per row, by UTC day.

PortFirst seenLast confirmedStatusTLS certificateJA4XConfiguration
:50050 · Cobalt Strike team-server defaultlisted03cf2b4bcb492166164053c1_2166164053c1_30d204a01551
:80listedbeacon

Observation history

Listed on 41 of the 63 days since this archive began recording, 2026-08-29 UTC.

  1. listed
  2. :50050
  3. :80

2026-08-292026-10-30

  • first seen to last confirmed
  • listed after its last confirmation

A marked day is a UTC day the feed listed this address. The feed keeps a listener for up to 90 days after its last confirmation, so a listed day is not a confirmation. A listener no longer in the feed is drawn to its last confirmation.

Listed days as dates
  • 2026-09-20 – 2026-10-30 (41 days)

Evidence

Each certificate, configuration and file appears once, with the listeners that carried it.

TLS certificate 03cf2b4bcb49

On :50050.

tls certificate03cf2b4bcb49ea00e9e1413fc9ca3b895e7f810f5a9cf86f10f102ddedacbd8d
cert subjectMajor Cobalt Strike
cert subject orgcobaltstrike
cert issuerMajor Cobalt Strike
cert issuer orgcobaltstrike
cert validity2026-09-15 → 2026-12-14
cert typeself-signed
cert key3072-bit
cert serial (hex)7b91c1614b971400
cert serial (decimal)8904110561912361984

The names above are what the certificate claims, not proof that this host owns them. Treat a familiar name as a likely impersonation.

Beacon configuration

On :80.

callback156.239.224.131 · same as this host
beacon port80
beacon typeHTTP
cs versionCobalt Strike 4.8 (Feb 28, 2023)
getGET /ptj
postPOST /submit.php
user-agentMozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.2; InfoPath.3)
sleep60s ±0%
watermark987654321
server key md593b4743e1282d2f810fefb726af71b27
inject stube43a1b63f09794f74d90a9889f7acb77
spawn to x86%windir%\syswow64\rundll32.exe
spawn to x64%windir%\sysnative\rundll32.exe

Listeners

Each listener below shows its status and what sets it apart. Dates are in Ports; certificates, configurations and files in Evidence. Common to both listeners:

serviceip-port · tcp
networkAS154321 · CORENET CLOUD SDN. BHD

156.239.224.131:50050 · Cobalt Strike

listed · certificate 03cf2b4bcb49

confidence100 / 100
cohortshared issuance template · 3 hosts

156.239.224.131:80 · Cobalt Strike

listed · beacon

confidence98 / 100

Hosts sharing a value with this one

484 other hosts in this archive share at least one value with this one. Each is listed once, under its first shared value in Relations order. Dates and status are from the records that share a value. Showing the 40 that rank first. Every host shown is labelled Cobalt Strike, as this one is.

AddressSharesLast confirmedStatus
Issuance cohort · 2 other hosts · 2 listed

A shared value says the hosts were set up alike, not that one operator runs them.

106.52.8.22issuance cohort · JA4X templatelisted
123.207.246.48issuance cohort · JA4X templatelisted
JA4X template · 420 other hosts · 417 listed

These hosts’ certificates share one JA4X template, which points to the same certificate tooling. It is not evidence of a single operator.

Of these, 2 are listed under an earlier value and 380 are past the 40 hosts shown.

38.76.219.253JA4X templatelisted
101.200.193.211JA4X template · watermarklisted
8.163.59.20JA4X templatelisted
117.72.182.5JA4X templatelisted
192.252.185.78JA4X templatelisted
119.45.160.160JA4X template · watermarklisted
49.232.42.116JA4X templatelisted
156.239.252.191JA4X templatelisted
47.109.23.77JA4X templatelisted
113.250.188.15JA4X templatelisted
47.105.36.109JA4X templatelisted
85.175.101.203JA4X template · watermarklisted
47.251.177.187JA4X templatelisted
101.42.255.92JA4X templatelisted
8.152.212.104JA4X templatelisted
47.95.201.24JA4X templatelisted
154.12.86.154JA4X templatelisted
111.231.116.164JA4X template · watermarklisted
117.72.181.104JA4X templatelisted
60.247.206.23JA4X templatelisted
47.120.32.72JA4X templatelisted
117.72.242.9JA4X template · watermarklisted
43.108.51.124JA4X template · watermarklisted
222.255.215.42JA4X template · watermarklisted
116.198.233.179JA4X template · watermarklisted
82.156.219.31JA4X templatelisted
179.43.186.214JA4X template · watermarklisted
92.222.50.154JA4X templatelisted
85.121.5.211JA4X templatelisted
8.222.166.74JA4X templatelisted
64.177.112.233JA4X templatelisted
64.118.154.116JA4X templatelisted
54.164.24.73JA4X templatelisted
51.159.194.10JA4X templatelisted
47.97.206.32JA4X templatelisted
45.154.12.150JA4X templatelisted
43.138.225.166JA4X templatelisted
43.136.19.18JA4X templatelisted
Cobalt Strike watermark · 166 other hosts · 166 listed

The watermark identifies the Cobalt Strike licence a beacon was built with. Cracked and leaked builds share watermarks widely, so it is not evidence of a single operator.

Of these, 9 are listed under an earlier value and 157 are past the 40 hosts shown.

Samples served · 10 files

Files this address was seen serving, each identified by running or analysing it. A widely distributed file can reach unrelated hosts.

Every file here was served on :80.

FileConfirmedFile last seen
5147f4ea498bbc8245ce1bcaa896501873bb7424bddf942d4b47560704194af2analysed
385c1517cef23bf1fb0b6acb8c4278653b8c840ab65ba29124cd3796fdf76a18analysed
77a2ed26acd1e8c16a897310901d67a920136f59bf42897c6c88b482436d7f73analysed
1df494a8c3f8083421a3f48da6a06b9da64c66180204dc323629e14d6b117b27analysed
0b0aea2b8b1d648742e7a85f7b314fc0d23e3fabecdf72b7c4952ec55205aa9aanalysed
9ebb8393e6ddbf64919c8894c733b9fc165d53dc1ff7c316ede7b88576c04701analysed
d807e849d6d1e85517c0576c531dc918591b0bc7e186c5d7c1198504a0bea051analysed
8b686203739d856edbd885dc7d86df7f180ebf2423c5d12d97a20e4fab114a09analysed
6234e1f1cbd387267ded6e5085837245a50413f8e4930074edb3e88b319d813danalysed
139ecabd01e42f8d35b71e4d2b555624d99afa00ae1d8c491fee61687bffd5eeanalysed

Deploy

Suricata rules and hunt queries for this address’s 2 listed listeners.

Suricata rules

Each query searches the last 30 days of your logs for connections to these listeners and for the 10 files this address served. Queries hold only addresses, ports and file hashes.

Microsoft Defender XDR (KQL)
DeviceNetworkEvents
| where Timestamp > ago(30d)
| where (RemoteIP == "156.239.224.131" and RemotePort in (80, 50050))
DeviceFileEvents
| where Timestamp > ago(30d)
| where SHA256 in ("0b0aea2b8b1d648742e7a85f7b314fc0d23e3fabecdf72b7c4952ec55205aa9a", "139ecabd01e42f8d35b71e4d2b555624d99afa00ae1d8c491fee61687bffd5ee", "1df494a8c3f8083421a3f48da6a06b9da64c66180204dc323629e14d6b117b27", "385c1517cef23bf1fb0b6acb8c4278653b8c840ab65ba29124cd3796fdf76a18", "5147f4ea498bbc8245ce1bcaa896501873bb7424bddf942d4b47560704194af2", "6234e1f1cbd387267ded6e5085837245a50413f8e4930074edb3e88b319d813d", "77a2ed26acd1e8c16a897310901d67a920136f59bf42897c6c88b482436d7f73", "8b686203739d856edbd885dc7d86df7f180ebf2423c5d12d97a20e4fab114a09", "9ebb8393e6ddbf64919c8894c733b9fc165d53dc1ff7c316ede7b88576c04701", "d807e849d6d1e85517c0576c531dc918591b0bc7e186c5d7c1198504a0bea051")
Microsoft Sentinel (KQL)
CommonSecurityLog
| where TimeGenerated > ago(30d)
| where (DestinationIP == "156.239.224.131" and DestinationPort in (80, 50050))
Splunk (SPL, CIM data models)
| tstats summariesonly=false count min(_time) as first_time max(_time) as last_time
    from datamodel=Network_Traffic where earliest=-30d
    ((All_Traffic.dest_ip="156.239.224.131" (All_Traffic.dest_port=80 OR All_Traffic.dest_port=50050)))
    by All_Traffic.src_ip All_Traffic.dest_ip All_Traffic.dest_port
| tstats summariesonly=false count min(_time) as first_time max(_time) as last_time
    from datamodel=Endpoint.Filesystem where earliest=-30d
    (Filesystem.file_hash="0b0aea2b8b1d648742e7a85f7b314fc0d23e3fabecdf72b7c4952ec55205aa9a" OR Filesystem.file_hash="139ecabd01e42f8d35b71e4d2b555624d99afa00ae1d8c491fee61687bffd5ee" OR Filesystem.file_hash="1df494a8c3f8083421a3f48da6a06b9da64c66180204dc323629e14d6b117b27" OR Filesystem.file_hash="385c1517cef23bf1fb0b6acb8c4278653b8c840ab65ba29124cd3796fdf76a18" OR Filesystem.file_hash="5147f4ea498bbc8245ce1bcaa896501873bb7424bddf942d4b47560704194af2" OR Filesystem.file_hash="6234e1f1cbd387267ded6e5085837245a50413f8e4930074edb3e88b319d813d" OR Filesystem.file_hash="77a2ed26acd1e8c16a897310901d67a920136f59bf42897c6c88b482436d7f73" OR Filesystem.file_hash="8b686203739d856edbd885dc7d86df7f180ebf2423c5d12d97a20e4fab114a09" OR Filesystem.file_hash="9ebb8393e6ddbf64919c8894c733b9fc165d53dc1ff7c316ede7b88576c04701" OR Filesystem.file_hash="d807e849d6d1e85517c0576c531dc918591b0bc7e186c5d7c1198504a0bea051")
    by Filesystem.dest Filesystem.file_path Filesystem.file_hash
Elastic (EQL)
network where
  (destination.ip == "156.239.224.131" and destination.port in (80, 50050))
file where file.hash.sha256 in ("0b0aea2b8b1d648742e7a85f7b314fc0d23e3fabecdf72b7c4952ec55205aa9a", "139ecabd01e42f8d35b71e4d2b555624d99afa00ae1d8c491fee61687bffd5ee", "1df494a8c3f8083421a3f48da6a06b9da64c66180204dc323629e14d6b117b27", "385c1517cef23bf1fb0b6acb8c4278653b8c840ab65ba29124cd3796fdf76a18", "5147f4ea498bbc8245ce1bcaa896501873bb7424bddf942d4b47560704194af2", "6234e1f1cbd387267ded6e5085837245a50413f8e4930074edb3e88b319d813d", "77a2ed26acd1e8c16a897310901d67a920136f59bf42897c6c88b482436d7f73", "8b686203739d856edbd885dc7d86df7f180ebf2423c5d12d97a20e4fab114a09", "9ebb8393e6ddbf64919c8894c733b9fc165d53dc1ff7c316ede7b88576c04701", "d807e849d6d1e85517c0576c531dc918591b0bc7e186c5d7c1198504a0bea051")

Cite this record

Plain text, for a ticket or a report
Address 156.239.224.131 Family Cobalt Strike (command-and-control server) Ports :80, :50050 Status listed (feed checked 2026-10-30 18:37 UTC) First seen 2026-09-20 Last confirmed 2026-10-11 Record https://publicmosaic.com/ip/156.239.224.131 Source Public Mosaic, TLP:CLEAR